-Two ways of charging the product -At work, you can use a USB cable to charge the warmer -If youare outside, you can change the warmer to battery mode -The switch has 3 modes - (1, off ,2) -"1" - USB mode, Off, "2" - battery mode -Needs 3 AAA sized batteries -Takes 30 minutes to get warm, but long-lasting -Compact size: 7.5 cm -3 colors available: Sky blue, White and Pink